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These bolts are all partially threaded. Shorter lengths are found with full thread.
A low carbon steel for general use. A tempered medium carbon steel. Class 10.9 is stronger than class 8.8, and is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8. Unplated finish.
Flange bolts have a flange on the bottom of the head that distributes the load like a washer.